Lifting-jack.



J. F. PETHTEL.

LIFTING JACK.

APPLICATION min 050.11. 1915.

Patented Sept. 12,Y 1916.

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VJOHN' F. PETHTEL, OF BOISE, IDAHO.

LIFTING-JACK.

Specification of Letters Patent. Patented Sept, 12, 1916,

Application led December 11, 1915. Serial N o.' 66,290.

To all 'whom z5 may concern.'

Be it known that I, JOHN F. PETHTEL, a citizen of the United States,residing at Boise, in the county of Ada and State of Idaho, haveinvented certain new and useful Improvements in LiftingJacks; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention relates to new and useful improvements in lifting jacks andmore particularly to that class adapted to be used for elevating`vehicles, such as automobiles, or the like, and designed primarily foruse in garages and factories, and my object is to provide a framestructure and pivotally mount the same so that it may be swung upwardlyto raise the vehicle from off the floor.

A further object is to so construct the device that all four wheels maybe raised from the floor simultaneously.

A further object is to provide a lever for operating the frame and soposition the lever that the weight of the vehicle may be raised with theapplication of a minimum amount of leverage. And a further object is toso pivot the lever that it will pass beyond the center of gravity whenthe frame is raised to its uppermost position and hold the frame fromcasually descending.

Other objects and advantages will be hereinafter set forth and moreparticularly pointed out in the accompanying specification.

In the accompanying drawings which are made a part of this application,Figure 1 is a fragmentary side elevation of the jack showing the same inits lowered position by full lines and in its elevated position bydotted lines. Fig. 2 is a transverse vertical sectional view thereof asseen on line 2 2 of Fig. 1 with the frame in its elevated position. Fig.3 is an enlarged detail sectional view showing the manner of attachingthe lever to the frame. Fig. d is a transverse sectional view throughone of the frame supporting standards showing the anchoring basetherefor, and Fig. 5 is a similar view through the lever showing theanchoring base therefor. g

Referring to the drawings in which similar reference numerals designatecorresponding parts throughout the several views, 1 indicates the frameof the jack which comprises channel shape side rails 2 and connectingbars 3, said connecting bars being preferably angular shape and securedat the end s of the sidey rails. Pivotally secured at their upper endsto the side rails 2 are standards 4, the lower ends of said standardsbeing pivotally secured in flanged sockets 5' extending upwardly fromanchoring blocks 6, said anchoring blocks being in turn attached to thefloor structure 7 by means of bolts 8, or inany preferred manner. Oneedge of each socket 5 is open so that the standards may be readilylowered to the position shown in full lines in Fig. 1 or elevated to theposition shown by dotted lines in Fig. 1, the opposite end walls of thesockets limiting the swinging movement of the standards in onedirection.

In order to raise or lower the frame 1, a lever 9 is pivoted at itslower end in a slot 10 of an anchoring block 11, one edge of the slot-being open and the opposite edge thereof having an inclined wall 12against which the lever 9 rests when the frame 1 is in its elevatedposition, said wall being so inclined that when the lever engages thesame, the Lipper end of the lever will have passed beyond the verticalline extending through its lower end thereby employing the weight of thevehicle on the frame for locking the frame inelevated position.

The lever 9 is preferably curved from end to end and the upper endthereof passes between strap members 13, said strap members beingpivoted at one end between ears 14 carried by one of the cross bars 3 atthe end of the frame, said strap members having friction rollers 15between the ends thereof between which the end of the lever 9 passes andby providing the roller bearings the friction between the lever andstrap members will be practically eliminated.

In order to swing the lever 9 on its pivot and raise the frame 1 to anelevated position, one edge of the leveris provided with a shank 16 withwhich isto be'engage'd a lifting bar 17, said bar being hollow toreceive the shank and by asserting an outward pull on the lifting bar,the lever 9 will be thrown to a substantially vertical position and theframe 1 and its contents elevated, and in view of the peculiararrangement of the lever, the frame may be moved to its uppermostposition with a minimum amount of exertion on the part ofthe operator.

In operation, the anchoring blocks are secured to the iioor of thestructure in such position that an automobile or similar vehicle can bepositioned over the frame and after the vehicle is so positioned thelifting bar 17 is engaged with the shank 1G and an outward and downwardpull given thereto which will swing the frame upwardly and lift all fourwheels of the vehicle from off the floor, and in view of the fact thatthe lever passes beyond the center of gravity,

the weight of the vehicle will serve to lock the lever against casualrotation on its pivot and thus hold the frame in elevated position.

After the car has been repaired, an up- -ward lifting movement isimparted to the bar 17 which will result in swinging the lever 9 beyondthe center of'gravity in the opposite direction when the frame l willreadily descend to its lowermost position and rest the wheels of the carupon the floor from whence it may be driven or otherwise prolpelled fromover the frame of the lifting Jac In view of the simplicity of thisdevice, it can be very cheaply constructed and readily installed for useand does not require the adjustment of parts of the jack, as does theordinary jack, for engaging the same with the axles of the vehicle,other than the one movement of the lifting bar which operates to elevatethe frame into engagement with the axles of the vehicle and also forraising the vehicle from oif the floor upon which it is resting. It willlikewise be seen that by attaching the operating lever to the framethrough the medium of the strap members that said strap members willadjust themselves to the movement of the lever in view of their pivotalconnection with the ears attached to the cross bar. It will likewise beseen that by forming the side rails, channel shaped, the highestefficiency of strength will be attained while at the same time theweight of the side rails will be reduced to a minimum. And it willlikewise be seen that by mounting the lever as shown the upper endthereof will pass beyond the vertical line extending through its pivotpoint, when in an elevated position, whereby the weight on the framewill act on said lever to lock the frame in elevated position.

Having thus fully described, my invention what I claim as new and desireto secure by Letters Patent of the United States, is

l. A lifting jack, the combination with a frame and pivotally mountedstandards carrying the frame, of a lever, an anchoring block to whichsaid lever is pivotally attached, apair of friction. rollers carried bythe frame between which one end of the lever extends, and a lifting baradapted to be removably engaged with said lever whereby power may beapplied for elevating they frame.

2. A lifting jack comprising a. frame, standards pivotally secured attheir upper ends to said frame, anchoring blocks having sockets in whichthe lower ends of said standards are pivotally mounted, a lever, ananchoring block to which one end of the lever is pivoted, strap memberspivoted to said frame, friction rollers carried by the strap membersbetween which the free end of the lever extends, and a lifting bar forswinging said lever on its pivot to raise or lower the frame.

3. A lifting ack comprising a frame, pivotally mounted standardscarrying said frame, a lever, an anchoring block to which one end ofsaid lever is pivotally attached, a pair of strap members pivoted tosaid frame, friction rollers carried by said strap members between whichthe free end of said lever extends, a shank on the lever, and a liftingbar adapted to cooperate with said shank to swing the lever on its pivotto raise or lower the frame.

4. In a lifting jack, the combination with a frame and pivotedsupporting means therefor, of a lever, an anchoring block having a slotin which one end of the lever is pivotally mounted, said slot having aninclined wall at one end, means to slidably attach the lever to theframe, and lifting bar adapted to move said lever upwardly and intoengagement with said inclined wall when power is applied thereto, saidlever when engaging said inclined wall resting in a plane beyond thevertical line through the pivot point of the lever.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN F. PETHTEL.

Viitnesses:

W. A. LINDsnY, EMIL ERICKSON.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

